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Derivative Instruments, Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Interest rate derivatives [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 5.2 | $ 7.8
Gross Amounts Offset in the Balance Sheet | 0 | 0
Amounts of Liabilities Presented in the Balance Sheet | 5.2 | 7.8
Financial Instruments | (1.7) | (2.6)
Cash Collateral Paid | 0 | 0
Amounts That Would Have Been Presented On Net Basis | 3.5 | 5.2
Commodity derivatives [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | 38.3 | 55.1
Gross Amounts Offset in the Balance Sheet | 0 | 0
Amounts of Liabilities Presented in the Balance Sheet | 38.3 | 55.1
Financial Instruments | (24.8) | (41.0)
Cash Collateral Paid | (4.1) | (9.3)
Amounts That Would Have Been Presented On Net Basis | $ 9.4 | $ 4.8

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